linux-kernel - [BUG] 2.6.30-rc4: Kernel BUG under network load with gianfar

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Message-Id: <50F164E7-D247-4FD6-B41B-BDAA8681166B@it-loops.com>
Date:	Sun, 3 May 2009 15:36:27 +0200
From:	Michael Guntsche <mike@...loops.com>
To:	linux-kernel@...r.kernel.org
Subject: [BUG] 2.6.30-rc4: Kernel BUG under network load with gianfar

Hello list,


I recently tried 2.6.30-rc4 on a routerboard currently running 2.6.29  
(it is running stable with this kernel).

This board is used as a gateway and under load I see the following BUG  
with 2.6.30-rc4.

------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:126!
Oops: Exception in kernel mode, sig: 5 [#1]
MikroTik RouterBOARD 600 series
Modules linked in: nf_nat_rtsp nf_conntrack_rtsp
NIP: c01abc68 LR: c01abc68 CTR: c015559c
REGS: c7aa7b20 TRAP: 0700   Not tainted  (2.6.30-rc4)
MSR: 00029032 <EE,ME,CE,IR,DR>  CR: 24002424  XER: 20000000
TASK = c7855bc0[588] 'pptpgw' THREAD: c7aa6000
GPR00: c01abc68 c7aa7bd0 c7855bc0 00000085 0000295e ffffffff c0152b68  
00000030
GPR08: c03848d4 c0350000 0000295e c0380398 84002422 10029614 100de49c  
100e0000
GPR16: 100b45a0 00000040 c02f6260 c02f628c c7846380 c7aa6000 c7957800  
00000000
GPR24: 00000002 0000003e c7a12480 c7957a00 c7846000 000005e6 c7956240  
c7a8b880
NIP [c01abc68] skb_over_panic+0x48/0x5c
LR [c01abc68] skb_over_panic+0x48/0x5c
Call Trace:
[c7aa7bd0] [c01abc68] skb_over_panic+0x48/0x5c (unreliable)
[c7aa7be0] [c01ad468] skb_put+0x5c/0x60
[c7aa7bf0] [c0187650] gfar_clean_rx_ring+0x204/0x42c
[c7aa7c40] [c0189074] gfar_poll+0x258/0x338
[c7aa7c90] [c01b8b8c] net_rx_action+0x9c/0x190
[c7aa7cc0] [c002ddac] __do_softirq+0x84/0x100
[c7aa7cf0] [c0006474] do_softirq+0x58/0x5c
[c7aa7d00] [c002dc24] irq_exit+0x94/0x98
[c7aa7d10] [c0006518] do_IRQ+0xa0/0xc4
[c7aa7d30] [c0014448] ret_from_except+0x0/0x14
--- Exception: 501 at ppp_asynctty_receive+0x1d8/0x550
     LR = ppp_asynctty_receive+0x4a4/0x550
[c7aa7df0] [c0197734] ppp_asynctty_receive+0x324/0x550 (unreliable)
[c7aa7e40] [c014def4] pty_write+0x74/0x8c
[c7aa7e50] [c0148f1c] n_tty_write+0x2b0/0x430
[c7aa7eb0] [c0145f34] tty_write+0x188/0x268
[c7aa7ef0] [c00903cc] vfs_write+0xb4/0x1a4
[c7aa7f10] [c009096c] sys_write+0x4c/0x90
[c7aa7f40] [c0013db0] ret_from_syscall+0x0/0x38
--- Exception: c01 at 0xff2d5c4
     LR = 0x10003a48
Instruction dump:
80a30054 2f800000 80e300a8 810300ac 816300a0 814300a4 419e0020 3c60c030
7d695b78 90010008 3863901c 4be7d091 <0fe00000> 48000000 3d20c02d  
380968b8
Kernel panic - not syncing: Fatal exception in interrupt
Call Trace:
[c7aa7970] [c0008274] show_stack+0x4c/0x16c (unreliable)
[c7aa79b0] [c0027d1c] panic+0x90/0x170
[c7aa7a00] [c00118ac] die+0x19c/0x1d4
[c7aa7a20] [c0011b80] _exception+0x138/0x15c
[c7aa7b10] [c00143fc] ret_from_except_full+0x0/0x4c
--- Exception: 700 at skb_over_panic+0x48/0x5c
     LR = skb_over_panic+0x48/0x5c
[c7aa7be0] [c01ad468] skb_put+0x5c/0x60
[c7aa7bf0] [c0187650] gfar_clean_rx_ring+0x204/0x42c
[c7aa7c40] [c0189074] gfar_poll+0x258/0x338
[c7aa7c90] [c01b8b8c] net_rx_action+0x9c/0x190
[c7aa7cc0] [c002ddac] __do_softirq+0x84/0x100
[c7aa7cf0] [c0006474] do_softirq+0x58/0x5c
[c7aa7d00] [c002dc24] irq_exit+0x94/0x98
[c7aa7d10] [c0006518] do_IRQ+0xa0/0xc4
[c7aa7d30] [c0014448] ret_from_except+0x0/0x14
--- Exception: 501 at ppp_asynctty_receive+0x1d8/0x550
     LR = ppp_asynctty_receive+0x4a4/0x550
[c7aa7df0] [c0197734] ppp_asynctty_receive+0x324/0x550 (unreliable)
[c7aa7e40] [c014def4] pty_write+0x74/0x8c
[c7aa7e50] [c0148f1c] n_tty_write+0x2b0/0x430
[c7aa7eb0] [c0145f34] tty_write+0x188/0x268
[c7aa7ef0] [c00903cc] vfs_write+0xb4/0x1a4
[c7aa7f10] [c009096c] sys_write+0x4c/0x90
[c7aa7f40] [c0013db0] ret_from_syscall+0x0/0x38
--- Exception: c01 at 0xff2d5c4
     LR = 0x10003a48

After that the Board reboots after 180 seconds. To reproduce this  
problem I just have to stream audio or run some benchmarks on http://speedtest.net 
.

Doing the same with 2.6.29 does not inhibit this problem.

Please CC me on any replies since I am not subscribed to the list. If  
you need more information please just tell me.

Kind regards,
Michael 
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